* Spider monkeys as a species: They are a group of New World monkeys within the genus *Ateles* and have been around for a very long time. Their evolutionary history is complex and not fully understood, but they likely diverged from other New World monkeys around 25-30 million years ago.
* The term "spider monkey": It's difficult to say when the term was first used to refer to these monkeys. It's likely that the name arose naturally from their appearance, with their long limbs and prehensile tails resembling a spider.
If you can clarify your question, I can provide a more specific answer.